4670479
Descripción
Test por TRAVIS CANNING, actualizado hace más de 1 año
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Creado por TRAVIS CANNING
hace más de 8 años
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Pregunta 1
Pregunta
The two classifications of steam turbines include:
Respuesta
-
induction and extraction
-
condensing and non-condensing
-
impulse and reaction
-
compound and cross-compound
-
all of the above
Pregunta 2
Pregunta
The two types of steam turbines include
Respuesta
-
induction and extraction
-
condensing and non-condensing
-
impulse and reaction
-
compound and cross-compound
-
all of the above
Pregunta 3
Pregunta
Impulse turbine blades
Respuesta
-
create considerable end thrust
-
convert heat energy into kinetic energy
-
are either bucket shape or nozzle shaped
-
convert kinetic energy into useful work
-
are typically used in the low pressure stages of a turbine
Pregunta 4
Pregunta
Reaction turbine blades
Respuesta
-
are nozzle shaped
-
are bucket shaped
-
are a combination of bucket and nozzle shaped
-
produce little end thrust
-
all of the above
Pregunta 5
Pregunta
The pressure remains constant across the moving blades of an impulse turbine
Respuesta
- True
- False
Pregunta 6
Pregunta
The force applied to the blade is caused by changing the direction of the stream flow in an impulse turbine
Respuesta
- True
- False
Pregunta 7
Pregunta
Steam pressure drops across the moving blades of an impulse turbine
Respuesta
- True
- False
Pregunta 8
Pregunta
In a reaction turbine the steam pressure drops in both the stationary and rotating blades
Respuesta
- True
- False
Pregunta 9
Pregunta
In a reaction turbine the steam expands in the moving blades producing a reaction force
Respuesta
- True
- False
Pregunta 10
Pregunta
In a reaction turbine the velocity of the steam decreases in the stationary and moving blades
Respuesta
- True
- False
Pregunta 11
Pregunta
In a reaction turbine blade clearance between the rotor and the casing must be kept at a maximum to prevent rubbing.
Respuesta
- True
- False
Pregunta 12
Pregunta
Nozzles are used on steam turbines to
Respuesta
-
reduce the steam velocity to the blading
-
increase the enthalpy of the incoming steam
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prevent moisture from entering the low pressure stages of the turbine
-
convert heat energy into kinetic energy
-
convert pressure energy into potential energy
Pregunta 13
Pregunta
The throttling effect of steam through a turbine nozzle
Respuesta
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increased superheat, reduces pressure and increases the steam volume
-
reduced superheat, increases pressure and increase the steam volume
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no change in superheat, reduces pressure and increases the steam volume
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increased superheat, increased pressure, increased volume
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heat loss, enthalpy gain and increase in velocity
Pregunta 14
Pregunta
In which type of turbine does the steam pressure drop in the nozzle and then remain constant through both the stationary and moving blades:
Respuesta
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pressure compounding impulse turbine
-
reaction turbine
-
velocity compounded impulse turbine
-
non-condensing impulse turbine
-
none of the above
Pregunta 15
Pregunta
Steam velocity, blade velocity may be reduced in a multistage impulse turbine by:
1. Reducing turbine vacuum
2. pressure compounding
3. increasing blading length
4. velocity compounding
Respuesta
-
1,2
-
2,3
-
1,3
-
2,4
-
3,4
Pregunta 16
Pregunta
Compounding steam turbines is used primarily to:
1. counteract axial thrust
2. reduce turbine rotor speed
3. Reduce friction losses
4. reduce turbine blade erosion
5. reduce turbine noise
Respuesta
-
1,3,5
-
2,3,4
-
2,3
-
1,2,3,4,5
-
2,4
Pregunta 17
Pregunta
A dummy piston with balance pipe is used primarily on reaction turbines to:
Respuesta
-
reduce the clearance space between the blade tip and the casing
-
reduce turbine vibration
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eliminate the use of a thrust bearing
-
offset the end thrust produced
-
none of the above
Pregunta 18
Pregunta
A turbine thrust bearing is typically lined with a soft metal known as
Respuesta
-
brass
-
babbit
-
lead
-
carbon
-
inconel
Pregunta 19
Pregunta
The purpose of a thrust bearing on a steam turbine is to:
1. Absorb rotor axial thrust
2. Reduce turbine vibration
3. Prevent steam leakage
4. Reduce steam velocity
5. keep the rotor in place within the casing
Respuesta
-
1,2,5
-
1,2,3,4
-
2,3,4,5
-
1,2,3,4,5
-
1,5
Pregunta 20
Pregunta
Different types of steam turbine plants may be classified as:
Respuesta
-
impulse and reaction
-
compound and cross compound
-
condensing and non-condensing
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SAGD and HRSG
-
Steam turbine and gas turbine
Pregunta 21
Pregunta
In addition to having a high thermal cycle efficiency, condensing steam plants have the following advantage.
Respuesta
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a large amount of cooling water is required
-
low initial cost
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little space is required
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recovery of condensate is possible
-
all of the above
Pregunta 22
Pregunta
This type of turbine acts like a pressure reducing valve.
Respuesta
-
Back pressure Turbine
-
Rateau Turbine
-
Extraction turbine
-
Induction turbine
-
Cross-compound Turbine
Pregunta 23
Pregunta
This type of steam turbine has a better overall efficiency than a purely condensing steam turbine.
Respuesta
-
gas turbine
-
cross-compounded
-
tandem double-flow
-
bleeder turbine
-
none of the above
Pregunta 24
Pregunta
Another name for a condensing bleeder turbine would be referred to as
Respuesta
-
induction turbine
-
closed cycle steam turbine
-
extraction turbine
-
topping turbine
-
back pressure turbine
Pregunta 25
Pregunta
This type of turbine allows new high pressure boilers to provide steam to old lower pressure systems and could also be the back pressure turbine of a cross compound system
Respuesta
-
governing turbine
-
topping turbine
-
induction/extraction turbine
-
condensing turbine
-
reducing station turbine
Pregunta 26
Pregunta
The purpose of a coupling on a turbine is to:
Respuesta
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A) compensate for axial expansion and contraction of the rotor
-
B) transmit power from one shaft to the other
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C) keep the shaft from vibrating
-
D) both a and b
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E) all of the above
Pregunta 27
Pregunta
The following pump is utilized on a turbine rotor while on barring gear to prevent rubbing inside the bearings
Respuesta
-
lifting oil pump
-
boilerfeed pump
-
hydraulic oil pump
-
jacking oil pump
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